Why is the battery light on in the car?
2 Answers
The reasons why the battery light is on in the car: 1. The generator is driven by a belt and pulley, and the tensioner mainly tightens the belt to prevent slipping. If the generator belt or tensioner is too loose, it can cause the power supply system to malfunction and trigger the battery light; 2. Severe oxidation or looseness of the battery terminals, leading to poor contact and the battery light coming on; 3. Malfunction of the generator voltage regulator, excitation circuit failure, or other abnormal operations causing the battery light to illuminate; 4. The battery is depleted. The service life of a car battery is about 2 years. After more than 2 years of use, the owner should regularly inspect and maintain the battery. On one hand, this can extend the battery's lifespan, and on the other hand, it can prevent power loss or malfunctions.
When the battery light on the car comes on, it usually signals a problem with the charging system. The alternator may not be working properly, causing the battery to drain instead of charge. Common causes include damage to the alternator itself, such as burned-out stators or rotors inside; or the alternator belt may be loose or broken, preventing it from generating electricity. An aging battery can also trigger the warning light, especially when the voltage is too low. Once, I ignored the light on the highway, and the battery drained completely, causing the car to stall—it was quite dangerous and nearly led to an accident. It's important to address this issue promptly; otherwise, the battery could die completely, and the car might stall, potentially damaging electronic components like the audio system or infotainment system. If you see the light come on, don't delay—find a safe place to stop and check, preferably taking it to a professional repair shop for diagnosis. During regular maintenance, don't forget to test the alternator and battery condition to prevent failures, saving money and ensuring peace of mind.
